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    <title>Document</title>
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    <script>
        // 练习2：有已知以下某公司员工薪金信息，把每一位员工的salary薪金信息 加 2000，并返回新数组，注意：不影响原数组
      let persons = [
        {
          username: "张飞",
          sex: "男",
          salary: 50000,
        },
        {
          username: "关羽",
          sex: "男",
          salary: 60000,
        },
      ];
      let obj = JSON.parse(JSON.stringify(persons));
      let arr = obj.map(function (item) {
        item.salary += 2000;
        return item;
      });
      console.log(arr);
      console.log(persons);
    </script>
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